Electric-furnace resistor



Feb. 16 1926. 1,5?2381 F. H. BRACE ELECTRIC FURNACE RESISTOR Filed Nov. 14, 1922 wnuassas: 12.9 INVENTOR Clwy/gi Power fLBwace.

. av 1% gai auiaw f I flTTQRNE-I! ,Patented Feb. 16, 1926.

UNITED STATES PATENT OFFICE PORTER H. BBACE, F WILKINSBUBG, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING. COMPANY, A CORPORATION OF PENNSYL- VANIA.

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Application filed Rovember 14, 1922. Serial No. 600,808.,

To all whom it may conoem:

Be it known that I, PORTER H. Bangs, a. citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented 1 and particularly to electric-resistance furnaces.

The object of my invention is to provide a compact, rugged, built-up corbonaceous 'resistor that shall have a relatively high electric resistance.

tively to each other. Water cooled electric- In practicing my invention, 1 provide a plurality of members of a refractory resistor material located in co-extensive spaced'rela-- tionand a plurality of symmetrically spaced o: refractory electric-conducting blocks opera- .tively engaging the adjacent members. The alternate sets of blocks are staggered relacircuit terminals are provided at each end of the setsof blocks and also resilient compress- 'ing means for the members, blocks and terminals.

the single sheet of drawings,

I" Figure-1 is a view, in vertical section, of an electric-resistance furnace comprising the the line II of Fig. 2,

I Fig. 2 is a top plan view of an electric furnace comprising the device embodying my invention, F1g. 3 1s a view, in side elevation, of a heating element embodying my invention,

Fig. 4is a top plan view thereof, "Fig, 5 is a fragmentary view, in crosssoction, of a modified form of a resistor element, and

.Fig. 6 is a fragmentary View, in side eleiyat-ion, of a further modification of a resister element.

An electric-resistance furnace, designated g' er'ally by the numeral 11, comprises a metallic casing 12, of any suitable or desired contbur and dimensions, which is provided with a metallic bottom plate'13 having an outer annular portion projecting beyond the casing-:12. An outer lining .14, located within the casing 12, comprises a plurality of bricks\or blocks of a suitable refractory heat-insulating material. An inner lining 15 comprises a plurality of bricks or blocks of a suitable highrtemperatureassisting refractory material, the walls formed by the inner lining being so spaced apart as to provide achamber 16 therein.

Within the chamber 16, which is here illustrated as being substantially cylindrical in contour, is located a built-up resistor or heating element 17 that comprises a pluengaging the opposite surfaces of any one ring may be staggered relatively to eaEh other, substantially as indicated in Fig. 4 of the drawing.

At each end of the heating element 17 is provided a metallic Water cooled terminal member 21 which may be annular in form in order to provide a relatively large contact surface with the end ring. A red or bar 22 may be provided to extend zit-right angles to the surface of each of the terminal members 21 and be electrically connected thereto and be provided with a plurality of nuts 23 having screw threaded engagement therewith, to permit of connecting thereto the ends of suitable supply-circuit conductors, (not shown).

In order to insure close opcrativc engagement between the blocks 19 and the rings 18, I provide a plurality of resilient spring members 24, here shown as three in number, one end of each ofwhich operatively engages the outer surface of one of the terminal members 21 and the other end of which is operatively engaged by a metallic cover plate 25. A plurality of rods 26 may be provided to extend through suitable openings in the bottom plate 13 and in the cover plate 25, and nuts 26 may be located thereon, outside of the bottom plate and the cover plate, to permit of securin any desired degree of pressure on the bui t-up heating element 17. 

